Issues of interest to the officer or his alleged handlers included weapons systems and migration, Austrian Defence Minister Mario Kunasek said, adding that it was not clear whether the case was an isolated one.
The youngest ever foreign minister in a European country, 31-year-old Sebastian Kurz is the frontrunner in the race to become the next chancellor of Austria and the anti-immigration millennial is being heavily touted as the likely candidate to win the country’s general election.
Kern's Social Democrats and Kurz's conservatives have been partners in the coalition government and have dominated Austrian politics for decades. In May the party chiefs agreed to a snap election after the centrist "grand coalition" collapsed.
The decision follows a similar move by the Netherlands, which said on Friday that Turkish Deputy Prime Minister Tugrul Turkes was not welcome to visit for a ceremony among Turkish expatriates to commemorate the anniversary. There was no immediate comment from Turkey.
Austria has moved four armoured vehicles close to its border with Italy to guard against migrants and will likely set up controls on a key trade crossing "very soon", Defence ministry officials said on Tuesday.